Utility knife



FIG. 1 is a perspective view of a utility knife showing my new design with the blade being extended therefrom;

FIG. 2 is a front end view thereof;

FIG. 3 is a rear end view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is another perspective view of the utility knife with the blade being retracted thereinto.

The broken line in FIGS. 1, 4, 5 and 8 forms no part of the claimed design. 

The ornamental design for a utility knife, as shown. 